Furnace-grate



(No Model.)

E. P. BASVTWICK, Jr.

PURNACE GRATB.

Patent Zzgl - 2 Sheets-Sheet 1.

ed Nov. 12, 1895.

ANDREW EGRAIIAM. FHUTOLITHQWASHINGTDN. D.C.

ATTORNEYS.

UNITED STATES PATENT OEETCE.

EDVARD P. EAS'IVVICK, JR., OF NEW ORLEANS, LOUISIANA.

FuRNA'cE-GRATE.

SPECIFICATION forming partrof Letters Patent No. 549,850, dated November 12, 1895. Application tiled J'une 29, 1895. lSerial No. 554,431. (No model.)

To all whom/t may concern.-

Be it known that I, EDWARD P. EAsTwIcK, .I r., of New Orleans, in the parish of Orleans and State of Louisiana, have invented a new and Improved Furnace-Grate, of which the following is a full, clear, and exact description.

My invention relates to grates which receive fuel upon their surfaces to undergo combustion and discharge the ashes or unconsumed fuel at their ends or sides, and especially applies to what are known as traveling grates or stokers, which continuously and automatically receive their fuel and discharge their refuse. In the practical use of grates of the above description the experience is that the fuel falling on or passing over or while being carried on the grates sifts through them unconsumed and by mixing with the ashes discharged is wasted; also, that an excessive amount of air is admitted to the furnace without passing through the grate.

My invention has for its object a remedy for these defects; and it consists in placing at the discharge side or end of the grate a hopper to receive and retain the ashes or refuse, having at its bottom an opening and under the same a valve or traveling conveyer adapted to release or carry away its contents in quantity as required, and at the same time keep the opening at the bottom of the hopper sufficiently closed to prevent a too free admission of air, which is undesirable, at the rear end of the furnace.

The invention further provides means for separating the unburned fuel from the ashes falling from the grate.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a transverse section through a portion of a boiler-furnace, the section being taken practically on the line l 1 of Fig. 2. Fig. 2 is a longitudinal section through a p0rtion of a boiler-furnace to which is applied the improved dischargingl apparatus; and Fig. 3 is a longitudinal sectional view of the rear Vportion of the grate and 1 ireboX of a boilersfurnace, illustrating a slight modification in the manner of discharging the ashes from the receiving-receptacle.

In the illustrations given in Figs. l and 2 the fuel is fed from. a hopper A on the upper stretchof the traveling grate B, which is of the variety known as the chain-grate, the grate being propelled in the direction of the arrows into and through the furnace. The fuel is carried along to be consumed in its passage toward the back part of the furnace, and when it reaches a point in the rear of the furnace removed a predetermined distance from the end wall l0 the unconsumed fuel leaves the grate and falls into a receptacle or hopper C, which is placed transversely in the rear portion of the furnace and immediately below the rear or delivery end of the grate.

'A conveyer D, usually consisting of an endless belt,is made to travel ordinarily the length of a chamber or ash-pit l1 at the bottom of the furnace, as shown in Fig. 2, and closely approaches the bottom of the hopper, which is opened at that point to discharge its contents on the said conveyer, and the opening 12 in the bottom of the hopper is carried a short distance up the front of the same. The hopper is placed between the rear end of the grate and the rear wall of the furnace, and the conveyer is constantly beneath the lower opening in the said hopper.

` I desire it to be distinctly understood that the conveyer D may be carried longitudinally through the Aash pit or chamber l1 from the hopper in direction of the front of the furnace, as shown in positive lines in Fig. 2, or carried in a reverse direction, as shown in dotted lines in the same ligure, or the conveyer may be made to travel transversely of and through the said chamber beneath the hopper, as may be desired. The conveyer may also, as shown in Fig. 2, be made to deliver the material to a chute 13, and the said IOO in the chamber I5, and may be readily removed therefrom.

The coal is delivered to the hopper A ordinarily through the medium of the feed-chute A, and any approved driving mechanism may be employed for propelling the grate, since such mechanism constitutes no portion of the invention. In the drawings the trunnion of one of the drum-supports for the grate is pro vided with a worm-wheel 17, which meshes with a worm 18 on a shaft 19, the said shaft being provided with a fixed ratchet-wheel 20, driven through the medium of a dog 2l operated from an eccentric 22, the said eccentric likewise serving to operate a second dog 23, in engagement with a ratchet-wheel 2i, secured on a shaft 25, connected with one of the supporting-drums of the main conveyerl).

In Fig. 3 the discharge arrangement for the ashes consists in having the bottom of the hopper closed and regulated by a valve 26, the valve being substituted for the conveyer I), and the lower chamber or ash-pit l1 is in this case preferably divided into two compartments 27 and 2S, one of them receiving the lower end of the hopper C. The refuse or ashes falling from the grate into the hopper may be allowed to accumulate, and the accumulation is continued by regulation of the conveyer in order to intercept in a measure the current of air passing therethrough.

Under the arrangement shown in Fig. 3 a car 2f) may be entered into the compartment 28 of the furnace below the hopper to receive the contents of the hopper. In any of the arrangements described an inclined plane may be substituted for the conveyor to discharge the ashes by gravity.

Ilaving thus described my invention, I claim as new and desire to secure by Letters Patentl. The combination with the endless grate and a longitudinal chamber below the lower run thereof, of a vertically disposed hopper closing the rear end of said chamber, and receiving at its upper open end the ashes from the inner end of the said grate, the lower open end of the grate discharging exterior to said open chamber, and means for regulating the exitof ashes from the said lower open end of the hopper an d thereby preventing an up draft of air therethrough into the rear end ot' the furnace, substantially as described.

2. The combination with the endless grate, of a vertically disposed hopper closed except at its ends and located at the discharge end of the grate to receive the ashes therefrom in its upper end, a traveling conveycr crossing the lower open end of the hopper, a portion of the lower edge ot the hopper adjacent to the discharge end of the conveyer being removed as at l2, whereby the conveycr will cause the hopper to retain suilicient ashes to prevent ingress of air through the lower end of the hopper, substantially as described.

The combination of the furnace having an endless grate, an. ash pit therebclow and a horizontal partition between the lower run of the grate and the ash pit, thereby forming a chamber under the gra-tc open at its front end, with a vertically disposed hopper closing the rear end of said chamber, receivil'ig ashes at its upper open end from the inner end of the grate and discharging at its lower open end through said partition into the ash pit and means at said lower openv end for regulating the discharge of ashes and preventing ingress of air through the hopper into the furnace, substantially as dcscri bed.

-L The combination of the furnace having an endless grate,an ash pit thereunder open at one end and ahorizontal partition between the lower run of the grate and the ash pit thereby forming a chamber open at the furnace front, with the vertically disposed hopper closing the rear end of said chamber, receiving the ashes at its upper open end from the inner end of the grate, and extending at its lower open end through said partition into the ash pit, the lower edge of the hopper facing the open end of the ash pit being eut away as at 12, and an endless conveyor extending lon gitudinally through the ash pit with its upper run crossing the lower open end of the said hopper for regulating the discharge of ashes and preventing ingress of air, substantially as described.

EDIV. P. IEASTWILK, JR.

Witnesses:

HELEN ANNA KLEMM, ARTHUR S. KLEMM. 

